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Product detailed specification
Bore size	99.75mm
Stroke	79.00mm
JE Pistons compression ratio (CR)	9.5:1
OEM compression ratio (CR)	8.0:1
Dome volume (CC)	-7.3cm3
Compression height (CH)	30.70mm
Pin diameter	23mm
Features	Accepts Turbo and Nitrous; FSR series Skirt, Ultra series
Fits for	Subaru Impreza WRX STI - 2.5 16V (EJ257)

Product detailed specification
Bore size	87.25mm
Stroke	91.00mm
Mahle compression ratio (CR)	12.5:1
OEM compression ratio (CR)	11.3:1
Dome volume (CC)	-9.2cm3
Compression height (CH)	32.30mm
Pin diameter	21mm
Features	Accepts Turbo and Nitrous
Fits for	BMW M3 E46 - 3.2 S54B32

ARP is a manufacturer of fasteners/bolts found in engines and drivelines, ranging from OEM replacement parts to specialty hardware for racing applications. ARP is the world leader in fastener technology.

ARP is a manufacturer of fasteners/bolts found in engines and drivelines, ranging from OEM replacement parts to specialty hardware for racing applications. ARP is the world leader in fastener technology.

Ferrea Competition Plus Valves have built a reputation as the industry's most reliable extreme duty valve. To manufacture the valves we use special aerospace quality alloys, including the EV8-Z18, which provides high tensile strength. An exclusive two-step slow forging process ensures proper grain flow and virtually eliminates any damage to thematerial structure. The valves are then heat-treated and stress-relieved over a 48-hour period, which is the crucial base of our molecular integrity. These valves feature avionics-quality hard chrome along with a specially applied hard tip.